zookeeper和远程调用RMI

rmi 服务支持

rmi 服务端注册服务

　　 public class HelloServiceImpl extends UnicastRemoteObject implements HelloService

　　 int port = 1099;
        String url = "rmi://192.168.11.131:1099/demo.zookeeper.remoting.server.HelloServiceImpl";
        LocateRegistry.createRegistry(port);
        Naming.rebind(url, new HelloServiceImpl());  // 注册一个服务端的service

rmi 客户端调用服务

　　public interface HelloService extends Remote

        String url = "rmi://192.168.11.131:1099/demo.zookeeper.remoting.server.HelloServiceImpl";
        HelloService helloService = (HelloService) Naming.lookup(url);
        String result = helloService.sayHello("Jack");
        System.out.println(result);   // 打印服务端返回的内容

public interface Constant {
 
    String ZK_CONNECTION_STRING = "127.0.0.1:2181";
    int ZK_SESSION_TIMEOUT = 5000;
    String ZK_REGISTRY_PATH = "/registry";
    String ZK_PROVIDER_PATH = ZK_REGISTRY_PATH + "/provider";
}

zookeeper 服务

　　   ZooKeeper zk = new ZooKeeper(Constant.ZK_CONNECTION_STRING, Constant.ZK_SESSION_TIMEOUT, new Watcher() {   // 连接 ZooKeeper 服务器并获取 ZooKeeper 对象
                @Override
                public void process(WatchedEvent event) {
                    // 执行节点变化
                }
            });

           // 创建节点
            if (zk != null) {
                 byte[] data = new byte[1024];   // 节点内容
                 String path = zk.create(Constant.ZK_PROVIDER_PATH, data, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL); // 创建一个临时性且有序的 ZNode
            }

 

         // 获取 ZK_REGISTRY_PATH  子节点的节点名称 并且对此监控 ，但是监控只能生效一次

   　　List<String> nodeList = zk.getChildren(Constant.ZK_REGISTRY_PATH, new Watcher() {
                @Override
                public void process(WatchedEvent event) {
                    if (event.getType() == Event.EventType.NodeChildrenChanged) {
                        // 若子节点有变化，则重新调用该方法（为了获取最新子节点中的数据）
                    }
                }
            });

　　　zk.getData(“/register/provider”, false, null);   // 获取该节点的内容